With 150gr jacketed bullets 19.0gr of 1680 is averaging 1870fps in my 16" barrel, 1730fps in my 11 1/2" barrel and 1480fps in my 7 1/2" barrel.
In my 16" barrel 12.0gr of 2400 averages 1527fps, 13.0gr does 1657fps.
6.5gr of TrailBoss in my 16" barrel averages 840fps.